Abstract: A biomaterial with a thromboresistant surface and a method for forming same are provided. The thromboresistant surface is comprised of a distinct coating layer of a chitosan-based membrane and a biologically active material. The biologically active material is capable of converting the chitosan membrane coating from a highly thrombogenic to an essentially non-thrombogenic one. The biologically active material can be a polymeric substance, such as polyvinyl alcohol, forming a polymeric blend with the chitosan, or, can be a biological substance, such as serum albumin, embedded in or attached to the chitosan membrane which has been activated with a treatment of glutardialdehyde. The thromboresistant biomaterial is suitable for use in vascular grafts having an inside diameter of less than 6 millimeters.

Abstract: A silver staining method is provided for staining an organic molecule capable of binding silver. An improved image is developed and visualized. A kit useful in practicing the method is described. A permanent record of the image of the profile of the stained molecules is obtained.

Abstract: A cytokine composition is prepared for use in immunotherapy of various diseases. The composition is prepared by culturing leucocytes previously infected with a virus in a culture medium containing a transal composition isolated from plasma and a complex of proteinase inhibitors composition isolated from plasma, separating leucocytes from the medium, removing impurities from the medium, and recovering a cytokine composition containing the transal composition and the complex of protease inhibitors composition. The transal composition contains transferrin, albumin and a 40 kDa protein and the complex of protease inhibitors composition contains .alpha..sub.2 -macroglobulin, a 160 kDa protein, an 80-60 kDa protein and a 20 kDa protein.

Abstract: An apparatus for the infusion of a liquid contained in an infusion bag. The apparatus includes a plate for receiving an infusion bag, and a box having a closable lid. Interaction between the lid, the plate and an elastic spring mechanism located inside the box results in the expulsion of fluid from the infusion bag. The elastic spring mechanism includes four arms that articulate in pairs to form two cross structures that are biased together with springs. Respective ends of the two cross structures are connected by rollers, while opposing ends of the two cross structures are connected to inside portions of the box.

Abstract: The activation device has a cord pull (8) on which at a certain distance two catches (9) are firmly attached. Via a gear system (10) the cord pull (8) is connected to a shaft (23) which passes through sliding elements (24) and which is connected to gears arranged in the sliding elements with curtain strips (34). The curtain strips (34) can be pivoted about 180.degree. with the shaft (23). If the curtain strips (34) are against a stop, the latter can be moved in one of the longitudinal directions of the curtain rail, in which case one of the stops (9) is engaged with the front running sliding element (24a). By activation of the cord pull (8) thus the curtain strips (34) can be pivoted about their longitudinal axes or moved in the longitudinal direction of the curtain rail horizontally.